可产生抑制性突触后电位的离子基础是
A．Na+B．K+C．Ca2+D．Cl-E．H+
参考答案：D
_____ of danger in the street at night, she had to go home, with a friend _____ her. [ ]
A. Warned, followed
B. Warning, following
C. Warning, followed
D. Warned, following
为什么要提倡母乳喂养
